2. 外语
  3. A certain rectangle has perimeter 54. If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of

A certain rectangle has perimeter 54. If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of

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问题 A certain rectangle has perimeter 54. If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of the rectangle?
选项 A、30
B、27
C、24
D、18
E、15
答案E
解析 一长方形的周长等于54，其长宽比为5：4，问该长方形的长为多少?
解：本题的正确答案为(E)。设该长方形的长和宽分别是5x，4x，由题意可得：(5x+4x)×2=54 → x=3， 5x=15
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